问题描述
我已经尝试了三天让 Rails 使用 fetch 将表单数据保存到数据库,但无济于事。在我的研究中,我遇到了 Stimulus JS 和 Stimulus Reflex。这可能是未来需要考虑的事情,但目前我很乐意让它发挥作用。
我正在使用 initSelect2 gem 输入标签。这些必须保存到与输入到其余输入中的数据库不同的数据库中。
点击提交按钮后,我正在准备如下值:
const project = {};
project.vision = document.querySelector('#project_vision').value || null;
...
console.log(project);
fetch(`../projects/`,{
method: 'POST',headers: {
'Content-Type': 'application/json','Accept': 'application/json','X-Transaction': 'Creating new project','X-Requested-With': 'XMLHttpRequest','X-CSRF-Token': document.querySelector("[name='csrf-token']").content
},body: JSON.stringify({project: project}),credentials: 'include'
})
.then(response => {
if (!response.ok) {
throw response;
}
return response.json();
})
.then(data => {
console.log('Success:',data);
alert('saved');
})
.catch(error => {
console.error('Error:',error);
alert('error');
});
});
相关控制器执行以下操作:
def create
@project = Project.create(project_params)
if @project.valid?
respond_to do |format|
format.json { render json: { "message": "success!",status: :ok } }
end
end
end
def project_params
params.require(:project).permit(
:name,:language,:slogan,:target,:pain,:solution,:originality,:vision,:db_design_url,:repo_url,:proto_url,:topics,:tags
)
end
在控制台中,我收到以下错误:
SyntaxError: The string did not match the expected pattern.
在网络选项卡中,我只得到:
An error occurred trying to load the resource.
这个问题似乎与强参数有关,尽管我不确定我在这里做错了什么。
更新 1
来自服务器日志:
Started POST "/projects/" for ::1 at 2021-01-03 01:14:13 +0100
Processing by ProjectsController#create as JSON
Parameters: {"project"=>{"name"=>nil,"tags"=>[],"language"=>"Rails","slogan"=>nil,"target"=>nil,"pain"=>nil,"solution"=>nil,"originality"=>nil,"vision"=>nil,"db_design_url"=>nil,"repo_url"=>nil,"proto_url"=>nil}}
User Load (0.6ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2 [["id",1],["LIMIT",1]]
Unpermitted parameter: :tags
No template found for ProjectsController#create,rendering head :no_content
Completed 204 No Content in 13ms (ActiveRecord: 0.6ms | Allocations: 3948)
# Project model
class Project < ApplicationRecord
has_many :Feedbacks
has_many :teams
has_many :likes
has_many :issues
has_many :project_features
has_many :project_stages
has_many :project_tags
has_many :tags,through: :project_tags
validates :name,presence: true
end
在图形上,简化的部分架构如下所示:i.stack.imgur.com/rTHJ6.png
控制台错误消息的屏幕截图:https://imgur.com/a/IPq1FLP
更新 2
我现在单独发送标签,从而摆脱了“不允许的参数”。但是,如果条目无效,我仍然会收到一条无用的错误消息,而不是说明缺少必填字段:
Started POST "/projects/" for ::1 at 2021-01-03 01:42:21 +0100
Processing by ProjectsController#create as JSON
Parameters: {"project"=>{"name"=>nil,"proto_url"=>nil},"tags"=>[]}
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2 [["id",1]]
No template found for ProjectsController#create,rendering head :no_content
Completed 204 No Content in 6ms (ActiveRecord: 0.3ms | Allocations: 3920)
解决方法
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